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Finding the Fourth Proportional to 391,406.20, 586,418.10 and 320,903.80

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Solution

The fourth proportional to 391,406.20, 586,418.10 and 320,903.80 is: 480,789.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,406.20 : 586,418.10 = 320,903.80 : x
  2. Step 2: Convert to fraction form
    391,406.20/586,418.10 = 320,903.80/x
  3. Step 3: Cross multiply
    391,406.20x = 586,418.10 × 320,903.80
  4. Step 4: Simplify right side
    391,406.20x = 188,183,796,678.78
  5. Step 5: Solve for x
    x = 188,183,796,678.78/391,406.20
  6. Step 6: Final answer
    x = 480,789.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.